I have 2 jl audio 12w3v3-2's svc they are in a sealed prefab box but the specs are pretty much spot on. These subs call for 1.25cu ft per chamber in a sealed enclosure the box has 1.26 which after speaker displacement puts you pretty much right at the exact specs. One of the subs has a cracked dust cap but the cone is in perfect condition and the sub's still sound mint! I am looking for a 4 channel amp that has at least 100x4@ 4ohms. full range.